kingpiece
nounEtymology king + piece
1
The central or most important element.
- The kingpiece in this deadly serious game is the 5th Air Force, largest of the two numbered Air Forces assigned to PACAF.1957, Airman, volumes 1-2, page 5:
2
Engineering, Metallurgy, Natural sciences, Physical sciences The last convex cake of congealed metal at the bottom of a furnace.